The total number of unique, three-base combinations of the four nucleic acid bas
ID: 258621 • Letter: T
Question
The total number of unique, three-base combinations of the four nucleic acid bases in DNA is
12.
16.
20.
64.
256.
The purpose of cloning is
to sequence a particular gene.
to obtain large numbers of a particular gene.
to obtain plasmids with a variety of genes.
to insert genes into plasmids
all of the above.
Which of the following is NOT correct for PCR?
It produces large amounts of DNA in a host, usually a bacterium.
It requires the presence of primers.
It can produce DNA from the root of a single human hair.
Some steps are carried out at high temperatures.
It works with a heat resistant DNA polymerase.
Which of the following pairs of molecules alternate to form the backbone of a polynucleotide chain?
adenine and thymine
cytosine and guanine
sugar and phosphate
base and sugar
base and phosphate
Explanation / Answer
1. (4) power 3 = 64
2.to obtain large number of a particular gene. Cloning is process to produce the genetically identical copies.
3.it produces large number of the DNA in a host, using a bacterium. PCR is in-vitro technique rather than invivo therefore it will not require any host for its replication.
4. Sugar and phosphate pairs to form the backbone of a polynucleotide chain.
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